/*
 * Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package java.beans;

import java.util.EventListenerProxy;

/**
 * A class which extends the {@code EventListenerProxy}
 * specifically for adding a {@code PropertyChangeListener}
 * with a "bound" property.
 * Instances of this class can be added
 * as {@code PropertyChangeListener}s to a bean
 * which supports firing property change events.
 * <p>
 * If the object has a {@code getPropertyChangeListeners} method
 * then the array returned could be a mixture of {@code PropertyChangeListener}
 * and {@code PropertyChangeListenerProxy} objects.
 *
 * @see java.util.EventListenerProxy
 * @see PropertyChangeSupport#getPropertyChangeListeners
 * @since 1.4
 */
public class PropertyChangeListenerProxy
    extends EventListenerProxy<PropertyChangeListener>
    implements PropertyChangeListener {

  private final String propertyName;

  /**
   * Constructor which binds the {@code PropertyChangeListener}
   * to a specific property.
   *
   * @param propertyName the name of the property to listen on
   * @param listener the listener object
   */
  public PropertyChangeListenerProxy(String propertyName, PropertyChangeListener listener) {
    super(listener);
    this.propertyName = propertyName;
  }

  /**
   * Forwards the property change event to the listener delegate.
   *
   * @param event the property change event
   */
  public void propertyChange(PropertyChangeEvent event) {
    getListener().propertyChange(event);
  }

  /**
   * Returns the name of the named property associated with the listener.
   *
   * @return the name of the named property associated with the listener
   */
  public String getPropertyName() {
    return this.propertyName;
  }
}
